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                                <h1 id="arraylist&#x6E90;&#x7801;&#x5206;&#x6790;">ArrayList&#x6E90;&#x7801;&#x5206;&#x6790;</h1>
<p>&#x6807;&#x7B7E;&#xFF08;&#x7A7A;&#x683C;&#x5206;&#x9694;&#xFF09;&#xFF1A; Java-Base</p>
<hr>
<h2 id="&#x7B80;&#x8FF0;">&#x7B80;&#x8FF0;</h2>
<p>ArrayList &#x662F;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x961F;&#x5217;&#xFF0C;&#x76F8;&#x5F53;&#x4E8E;&#x52A8;&#x6001;&#x6570;&#x7EC4;&#x3002;&#x4E0E;Java&#x4E2D;&#x7684;&#x6570;&#x7EC4;&#x76F8;&#x6BD4;&#xFF0C;&#x5B83;&#x7684;&#x5BB9;&#x91CF;&#x80FD;&#x52A8;&#x6001;&#x589E;&#x957F;&#x3002;&#x5B83;&#x7EE7;&#x627F;&#x4E8E;AbstractList&#xFF0C;&#x5B9E;&#x73B0;&#x4E86;List, RandomAccess, Cloneable, java.io.Serializable&#x8FD9;&#x4E9B;&#x63A5;&#x53E3;&#x3002;</p>
<ol>
<li>&#x5FEB;&#x901F;&#x968F;&#x673A;&#x8BBF;&#x95EE;&#xFF1A;&#x5B9E;&#x73B0;RandmoAccess&#x63A5;&#x53E3;&#xFF0C;&#x63D0;&#x4F9B;&#x968F;&#x673A;&#x8BBF;&#x95EE;&#x529F;&#x80FD;&#xFF0C;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x5143;&#x7D20;&#x7684;&#x5E8F;&#x53F7;&#x5FEB;&#x901F;&#x83B7;&#x53D6;&#x5143;&#x7D20;&#x5BF9;&#x8C61;;</li>
<li>&#x7EBF;&#x7A0B;&#x5B89;&#x5168;&#xFF1A;&#x975E;&#x7EBF;&#x7A0B;&#x5B89;&#x5168;&#xFF1B;</li>
<li>&#x5E8F;&#x5217;&#x5316;&#xFF1A;&#x5B9E;&#x73B0;Serializable&#x8FD9;&#x4E9B;&#x63A5;&#x53E3;&#x63A5;&#x53E3;&#xFF0C;&#x652F;&#x6301;&#x5E8F;&#x5217;&#x5316;&#x3002;</li>
</ol>
<p>&#x7EE7;&#x627F;&#x5173;&#x7CFB;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-java">java.lang.Object
   &#x21B3;     java.util.AbstractCollection&lt;E&gt;
         &#x21B3;     java.util.AbstractList&lt;E&gt;
               &#x21B3;     java.util.ArrayList&lt;E&gt;

<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ArrayList</span>&lt;<span class="hljs-title">E</span>&gt; <span class="hljs-keyword">extends</span> <span class="hljs-title">AbstractList</span>&lt;<span class="hljs-title">E</span>&gt;
        <span class="hljs-keyword">implements</span> <span class="hljs-title">List</span>&lt;<span class="hljs-title">E</span>&gt;, <span class="hljs-title">RandomAccess</span>, <span class="hljs-title">Cloneable</span>, <span class="hljs-title">java</span>.<span class="hljs-title">io</span>.<span class="hljs-title">Serializable</span> </span>{}
</code></pre>
<h2 id="&#x6DFB;&#x52A0;&#x5143;&#x7D20;--add">&#x6DFB;&#x52A0;&#x5143;&#x7D20;--add()</h2>
<pre><code class="lang-java">
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">add</span><span class="hljs-params">(E e)</span> </span>{
    <span class="hljs-comment">// &#x786E;&#x5B9A;ArrayList&#x7684;&#x5BB9;&#x91CF;&#x5927;&#x5C0F;</span>
    ensureCapacityInternal(size + <span class="hljs-number">1</span>);  <span class="hljs-comment">// Increments modCount!!</span>
    <span class="hljs-comment">// &#x6DFB;&#x52A0;e&#x5230;ArrayList&#x4E2D;</span>
    elementData[size++] = e;
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}

<span class="hljs-function"><span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">ensureCapacityInternal</span><span class="hljs-params">(<span class="hljs-keyword">int</span> minCapacity)</span> </span>{
    <span class="hljs-comment">//minCapacity&#xFF1A;&#x6700;&#x5C0F;&#x5BB9;&#x91CF; = size + 1&#xFF08;&#x5F53;&#x6267;&#x884C;add&#x65B9;&#x6CD5;&#x65F6;&#xFF09;</span>
    <span class="hljs-keyword">if</span> (elementData == DEFAULTCAPACITY_EMPTY_ELEMENTDATA) {
        minCapacity = Math.max(DEFAULT_CAPACITY, minCapacity);
    }
    ensureExplicitCapacity(minCapacity);
}

<span class="hljs-function"><span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">ensureExplicitCapacity</span><span class="hljs-params">(<span class="hljs-keyword">int</span> minCapacity)</span> </span>{
    modCount++;
    <span class="hljs-comment">// overflow-conscious code</span>
    <span class="hljs-keyword">if</span> (minCapacity - elementData.length &gt; <span class="hljs-number">0</span>)
        grow(minCapacity);
}

<span class="hljs-function"><span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">grow</span><span class="hljs-params">(<span class="hljs-keyword">int</span> minCapacity)</span> </span>{
    <span class="hljs-comment">// overflow-conscious code</span>
    <span class="hljs-keyword">int</span> oldCapacity = elementData.length;  
    <span class="hljs-comment">//&#x65B0;&#x5BB9;&#x91CF; = &#x65E7;&#x5BB9;&#x91CF; + &#x65E7;&#x5BB9;&#x91CF;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x6570;&#x53F3;&#x79FB;1&#x4F4D; &#xFF08;&#x4F8B;&#xFF1A;15 = 10 + 5&#xFF09;&#xFF0C;&#x5373;&#xFF0C;&#x6BCF;&#x6B21;&#x6269;&#x5BB9;&#x90FD;&#x589E;&#x52A0;&#x539F;&#x59CB;&#x5BB9;&#x91CF;&#x7684;&#x4E8C;&#x5206;&#x4E00;&#xFF0C;&#x51CF;&#x5C11;&#x6267;&#x884C;Arrays.copyOf()</span>
    <span class="hljs-keyword">int</span> newCapacity = oldCapacity + (oldCapacity &gt;&gt; <span class="hljs-number">1</span>);   
    <span class="hljs-keyword">if</span> (newCapacity - minCapacity &lt; <span class="hljs-number">0</span>)
        newCapacity = minCapacity;
    <span class="hljs-keyword">if</span> (newCapacity - MAX_ARRAY_SIZE &gt; <span class="hljs-number">0</span>)
        newCapacity = hugeCapacity(minCapacity);
    <span class="hljs-comment">// minCapacity is usually close to size, so this is a win:</span>
    elementData = Arrays.copyOf(elementData, newCapacity);
}

<span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> &lt;T,U&gt; T[] copyOf(U[] original, <span class="hljs-keyword">int</span> newLength, Class&lt;? extends T[]&gt; newType) {
    <span class="hljs-meta">@SuppressWarnings</span>(<span class="hljs-string">&quot;unchecked&quot;</span>)
    <span class="hljs-comment">//&#x9A8C;&#x8BC1;&#x53C2;&#x6570;&#x662F;&#x5426;Object[]&#x6570;&#x7EC4;&#xFF0C;&#x662F;&#xFF1A;new Object[]&#xFF1B;&#x5426;&#xFF1A;&#x8C03;&#x7528;Arrays&#x7684;native&#x65B9;&#x6CD5;newArray()</span>
    T[] copy = ((Object)newType == (Object)Object[].class)       
        ? (T[]) <span class="hljs-keyword">new</span> Object[newLength]
        : (T[]) Array.newInstance(newType.getComponentType(), newLength);

    <span class="hljs-comment">//&#x6700;&#x540E;&#x6267;&#x884C;&#x65B9;&#x6CD5;System.arraycopy()&#xFF0C;&#x8C03;&#x7528;native&#x65B9;&#x6CD5;arraycopy()&#xFF1B;&#x53C2;&#x6570;24&#xFF1A;&#x6E90;&#x6570;&#x7EC4;&#x4E0E;&#x76EE;&#x6807;&#x6570;&#x7EC4;&#x7684;&#x8D77;&#x59CB;&#x590D;&#x5236;&#x4F4D;&#xFF0C;&#x9ED8;&#x8BA4;&#x4E3A;0&#x3001;0</span>
    System.arraycopy(original, <span class="hljs-number">0</span>, copy, <span class="hljs-number">0</span>, Math.min(original.length, newLength));           
    <span class="hljs-keyword">return</span> copy;
}
</code></pre>
<h2 id="collections&#x6392;&#x5E8F;--collectionssort">Collections&#x6392;&#x5E8F;--Collections.sort()</h2>
<p>Collections&#x6392;&#x5E8F;&#x91C7;&#x7528;Timsort&#x6392;&#x5E8F;&#x5B9E;&#x73B0;&#xFF0C;&#x53C2;&#x8003;&#xFF1A;<a href="https://www.zybuluo.com/zero1036/note/618233" target="_blank">Timsort&#x6392;&#x5E8F;&#x7B97;&#x6CD5;</a></p>
<p>&#x4F7F;&#x7528;&#x65B9;&#x6CD5;&#xFF1A;</p>
<pre><code class="lang-java">List list = <span class="hljs-keyword">new</span> ArrayList&lt;Integer&gt;();
...
Collections.sort(list, <span class="hljs-keyword">new</span> Comparator&lt;Integer&gt;() {
    <span class="hljs-comment">/**
     * &#x5347;&#x5E8F;&#xFF1A;Comparator.compare(&#x53F3;&#x5143;&#x7D20;, &#x5DE6;&#x5143;&#x7D20;) &gt;= 0&#xFF1B;
     * &#x964D;&#x5E8F;&#xFF1A;Comparator.compare(&#x53F3;&#x5143;&#x7D20;, &#x5DE6;&#x5143;&#x7D20;) &lt; 0
     */</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">int</span> <span class="hljs-title">compare</span><span class="hljs-params">(Integer o1, Integer o2)</span> </span>{
        <span class="hljs-keyword">if</span> (o2 &gt; o1) {
            <span class="hljs-keyword">return</span> <span class="hljs-number">1</span>;
        } <span class="hljs-keyword">else</span> {
            <span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>;
        }
    }
});
</code></pre>
<h2 id="arrays&#x6392;&#x5E8F;--arrayssort">Arrays&#x6392;&#x5E8F;--Arrays.sort()</h2>
<h2 id="&#x53BB;&#x91CD;">&#x53BB;&#x91CD;</h2>
<h2 id="&#x5173;&#x4E8E;&#x7EBF;&#x7A0B;&#x5B89;&#x5168;">&#x5173;&#x4E8E;&#x7EBF;&#x7A0B;&#x5B89;&#x5168;</h2>
<p>java.util.ArrayList&#x5E76;&#x975E;java API&#x7684;&#x7EBF;&#x7A0B;&#x5B89;&#x5168;&#x7C7B;&#x578B;&#xFF0C;&#x800C;java.util.Vector&#xFF08;&#x77E2;&#x91CF;&#x961F;&#x5217;&#xFF09;&#x5219;&#x53EF;&#x4EE5;&#x7406;&#x89E3;&#x662F;ArrayList&#x7684;&#x7EBF;&#x7A0B;&#x5B89;&#x5168;&#x7248;&#x672C;&#x3002;&#x4F46;&#x4EE5;&#x4E0A;&#x4E24;&#x8005;&#x90FD;&#x4E0D;&#x662F;&#x7EDD;&#x5BF9;&#x7684;&#x7EBF;&#x7A0B;&#x5B89;&#x5168;&#x3002;&#x53C2;&#x8003;&#xFF1A;<a href="https://www.zybuluo.com/zero1036/note/633322" target="_blank">Vector&#x6E90;&#x7801;&#x5206;&#x6790;</a></p>
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